Commentary by Pigini

Revising IEC 60815

August 12, 2017 • ARTICLE ARCHIVE, Commentary by Pigini, Editorial ColumnsComments Off on Revising IEC 60815

Specifications contained in IEC 60815 “Selection and dimensioning of high-voltage insulators intended for use in polluted conditions” are the result of work going back to 2000 when international experts in WG11 first started to set up the documents. With collaboration from ad hoc CIGRE WGs, the first three specifications were published in October 2008...

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Assessing EHV & UHV Station Post Insulators

June 17, 2017 • ARTICLE ARCHIVE, Commentary by Pigini

Developments in station post insulator technologies can help minimize arcing distances needed at busbars, disconnectors and similar apparatus and therefore contribute to more flexible substation design. In general, station posts can be optimized by using...

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Artificial Pollution Tests for Polymeric Insulators

May 13, 2017 • ARTICLE ARCHIVE, Commentary by Pigini, Insulators

A few years ago, CIGRE WG C4.303 published Brochure 555, “Artificial pollution test for polymer insulators: results of a round robin test”, reporting on comparative pollution tests conducted at seven laboratories on two silicone line insulator samples....

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Failures from Improper Insulator Selection

April 29, 2017 • ARTICLE ARCHIVE, Commentary by Pigini, Insulators

A past CIGRE Study Committee session on Overhead Lines discussed the ‘state-of-the-art’ of composite insulator technology. A spectrum of contradictory case histories with these insulators was reported, ranging from complete satisfaction at one end to...

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Smart Insulators for Smart Grids

April 22, 2017 • ARTICLE ARCHIVE, Commentary by Pigini

A number of trends have been driving development of transmission and distribution networks: 1. Expected increase in electrical energy consumption by developing countries; 2. Shift from fossil fuels to electricity for key end use energy sectors worldwide (e.g....

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Polymeric Materials for HV Insulators

March 11, 2017 • ARTICLE ARCHIVE, Commentary by Pigini

It may surprise some but polymeric type insulators have been applied on high voltage lines and at substations since as far back as 1960. The best measure of their success in delivering real benefits versus traditional ceramic technologies is that they now...

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Passing of Two Leaders in Development of Insulation Coordination

March 4, 2017 • ARTICLE ARCHIVE, Commentary by Pigini

This past year, the world’s high voltage community lost two exceptional individuals who, apart from their unique skills, were also unusually charming gentlemen: Lorenzo Thione and Karl Heinz Weck. Among numerous other activities in the industry, Dr. Thione...

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Dielectric Strength & Air Density

Dielectric Strength & Air Density

February 11, 2017 • ARTICLE ARCHIVE, Commentary by Pigini

While a number of atmospheric parameters can affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, I will focus on the former, which plays a key role in developing...

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